AP Oldseminar

Tuesday, June 1, 2010, 15:00 (3:00 p.m.) - Session 4 in 2010
1. Homogenization of randomly microstructured metameterials and artificial quasimagnetism problem

Authors: Yu. N. Barabanenkov (1), M. Yu. Barabanenkov (2) (1 - Kotel’nikov Institute of Radio Engineering and Electronics, RAS, Moscow, Russia; 2 - Institute of Microelectronics Technology, RAS, Chernogolovka, Moscow Region, Russia), (45 min + 15 min for Q&A)

Abstract: The report discusses a physical mechanism of arising the effective magnetic permeability in spatially disordered discrete medium as statistical ensemble of non-magnetic dielectric and conducting particles, whose electric and magnetic susceptibilities give different contributions to the transversal and longitudinal components of ensemble effective dielectric permeability with spatial dispersion
..2. Atomic functions and «Arnold tongues» in phase locked loops with samples

Authors: V. F. Kravchenko, A. R. Safin (Kotel’nikov Institute of Radio Engineering and Electronics, RAS, Moscow, Russia), (45 min + 15 min for Q&A)
Abstract: Application of atomic functions (AFs) and “Arnold tongues” to the phase locked loop (PLL) systems with samples is presented for the first time. On the first step, the general theory of PLL with samples on the basis of the theory of discrete mappings is considered. On the second step, the symbolical method of solution of functional-differential equations with variable coefficients in a combination to the theory of atomic functions with reference to generating of periodic oscillations is stated. Such approach has allowed expanding physical zones of synchronizations (operating conditions) of fractional multiplicity of frequency in PLL with samples.
3. Construction of new complex WA-systems of Kravchenko functions in digital processing of temporal series

Authors: V. F. Kravchenko, D. V. Churikov (Kotel’nikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Moscow, Russia), (45 min + 15 min for Q&A)
Abstract: The modified Kravchenko atomic transformations are constructed and justified. The proof of the existence of the inverse Fourier transform in L1 and L2 spaces on the basis of the theory of atomic functions (AF) is presented. The new complex analytic wavelets are obtained. The numerical experiments and physical analysis of the results confirm the effectiveness of the proposed transformations and the new constructions of WA-systems of Kravchenko functions in the problems of digital signal and image processing.

Tuesday, April 6, 2010, 15:00 (3:00 p.m.) - Session 3 in 2010
1. A modification of the embedding method for analysis of horn arrays

Author: S. P. Skobelev (Company "Radiophyzika", Moscow, Russia) (45 min + 15 min for Q&A)

Abstract: A two-dimensional problem of TE wave radiation from an infinite periodic array of parallel-plate waveguides having sections with semi-transparent walls formed by rows of cylindrical conductors is considered. The problem is solved by the method of projective mode matching in the apertures of the waveguide sections with solid walls combined with the method of auxiliary sources accounting for the cylindrical conductors forming the semitransparent walls. The accuracy of calculations is controlled by using the power balance relation, boundary condition on the cylinders, and comparison of the results with measured data available in literature for some particular cases of the array geometry. The capabilities of the structure on shaping the sector element patterns is discussed and compared with other approaches to the indicated problem.
2. An accuracy increasing approach for the physical optics approximation in 3D diffraction problems including diffraction on a plane angular section

Authors: M. V. Vesnik (Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Moscow, Russia) (45 min + 15 min for Q&A)
Abstract: A heuristic approach modifying the solution based on the physical optics approximation for 3D diffraction problems (perfectly conducting planar angular sector and polyhedrons) is proposed. The purpose of modification is accuracy increasing of the final solution. Argumentation of the accuracy increasing is based on the results of analysis for diffraction solutions structure and 2D electromagnetic diffraction on perfectly conducting bodies.

March 2, 2010, 15:00 (3:00 p.m.) - Session 2 in 2010
1. A modification of the embedding method for analysis of horn arrays

Authors: V. L. Kuznetsov (1), S. P. Skobelev (2), and P. V. Filonov (2) (1 – Moscow State Technical University of Civil Aviation, 2 – Company "Radiophyzika", Moscow, Russia)

Abstract: A modification of the embedding method based on employment of the waveguide modes is proposed. General form of the embedding equations for the scattering matrix describing the horn transition is considered. The obtained equation has a Riccati form with coefficients depending of the horn geometry and excitation type. In case of E-polarization (two dimensional space), analytical expressions for the coefficients are obtained on the basis of the step transition and wedge models (using the mode-matching method). Analytical equivalence of both approaches is discussed. The problem of radiation of a horn phased array antenna is considered as a test problem. The proposed method shows good numerical coincidence of the results with data obtained with using the stepped horn method.
2. Method of computing of two-dimensional etalon radar images of simplest objects

Authors: S. V. Kovalev, S. M. Nesterov, I. A. Skorodumov (Moscow, Russia)
Abstract: A method of computing 2-D etalon radar images for sphere, cylinder and disc on the basis of using known exact solutions of the diffraction problems for the indicated objects is proposed. Dependence of the best resolution of the radar images on the sounding signal frequency deviation and sector of observation angles is obtained. Etalon 2-D radar images of sphere, cylinder, and disk of different electrical dimensions are obtained at back scattering within 185% frequency deviation.

Tuesday, February 2, 2010, 15:00 (3:00 p.m.) - Session 1 in 2010

1. Generalized Lorentz-Lorenz formula and artificial quasi-magnetism problem

Author: Yu. N. Barabanenkov (Institute of Radioengineering and Electronics named after V. A. Kotelnicov, Russian Academy of Sciences, Moscow, Russia) (45 min + 15 min for Q&A).

Abstract: Abstract: Using the Dyson equation technique it is given derivation a generalized Lorentz- Lorenz formula for effective dielectric permittivity of random discrete medium in the form of non-magnetic conducting particle’s statistical ensemble. The obtained formula allows taking into account the effects of particle spatial correlations as well as resonance phenomena at electromagnetic wave scattering by single particles and particle clusters. On example of statistically independent small in size and strongly reflected particles it is studied the contribution their electric and magnetic polarizability into effective dielectric permittivity of the ensemble. At the same time it is shown that in the framework of the considered approach with the statistical ensemble averaging, collection of spatially random distributed non-magnetic conducting particles does not contribute into effective magnetic susceptibility non-magnetic background medium.
2. NUMERICAL SIMULATION OF DYNAMICS OF ELECTROMAGNETIC FIELD IN MEDIA with negative permittivity and permeability

Authors: V. N. Kornienko V. A. Cherepenin (Institute of Radioengineering and Electronics named after V. A. Kotelnicov, Russian Academy of Sciences, Moscow, Russia) (45 min + 15 min for Q&A)
Abstract: The results of computer simulation of the dynamics of the electromagnetic field in media with positive and negative permittivity and permeability are presented. The frequency dispersion is ignored. An example of the dynamics of the field in a medium that has a line of radiation absorption in the working range of frequencies is demonstrated. Concluded that the need to use the microscopic Maxwell's equations for computer simulation of the dynamics of the field in areas containing metamaterials.

Tuesday, December 1, 2009, 15:00 (3:00 p.m.) - Session 7 in 2009
1. Methods of description of an electromagnetic field on a plane near a three-dimensional scatterer, based on measurement of its values in finite number of points on a closed contour

Authors: Ashikhmin A. V., Pasternak Yu. G., Rembovskiy Yu. A. (Company "IRKOS", Moscow, Russia)
Abstract: Methods of description of the scalar electromagnetic field component near a three-dimensional scatterer with a priori exactly unknown geometry and material properties, based on measurement of the field amplitudes and phases in finite number of points on a closed contour are stated. Using the method of discrete sources, the method of Kirchhoff integral, and also the methods of the theory of analytical functions of complex variable (Cauchy integral, Loran series) it is shown that it is possible to estimate amplitude-phase distribution of the field inside the closed contour having the diameter of 1.5-2.5 times larger than the initial one. It is shown, that the obtained values of the field (forming a "virtual" antenna array) can be used for improving the accuracy of the radio engineering system reception characteristics, in particular - for improving the accuracy of rating of angular coordinates of radio emission sources in a superwide frequency band, including frequencies of own scatterer resonances (with using no information about geometry and material properties of the scatterer)
2. Multilayer planar dielectric waveguides: new analytical results

Author: M. D. Kovalev
Abstract: Different forms of equations for the eigenvalues of effective index of refraction for TE- and TM-waves are discussed. Among them is a new one called a multilayer equation. Analyzing this equation the author obtained effective formulas for the number of TE- and TM-modes possible in a given waveguide.

Tuesday, November 3, 2009, 15:00 (3:00 p.m.) - Session 6 in 2009
1. A geometrical-optics analogue of a single mode Hermite-Gaussian beam

Author: R. E. Ilinsky (Special Design Bureau of the Moscow Power Engineering Institute, Moscow, Russia)
Abstract: A geometrical-optics analog of the single mode Hermite-Gaussian beam consists of a sequence of base modules. Each base module consists of a lens, a quasi-Lambertian radiation source and an amplitude filter. The sequence of these base modules creates a three-dimensional distribution of irradiance similar to the intensity of the electromagnetic field in a single mode Hermite-Gaussian beam. The geometrical-optics analog is used in the presented numerical example for calculation of transformation of the single mode Hermite-Gaussian beam by a lens.
2. On the aberrations in dual-reflector antennas with axial symmetry

Author(s): A. S. Venetskiy, V. A. Kaloshin (Institute of Radio Engineering and Electronics named after V. A. Kotelnikov of Russian Academy of Sciences, Moscow, Russia),
Abstract: A short derivation and analysis of a formula describing the phase front in the aperture of an axially symmetrical dual-reflector antenna with axial and lateral displacement of the feed from the focal point is presented. The formula takes into account all the aberration types of the eykonal up to the 3rd order of the displacement smallness. The eykonal distribution in the antenna aperture determined with using the obtained formula is compared with the exact geometric optics approach. The comparison of scanning properties of the aplanatic antennas calculated according to the obtained formula is made with the results obtained on the basis of the physical optics approach.

Thursday, October 15, 2009, 16:00 (4:00 p.m.) - Session 5 in 2009
1. On some versions of constructing the wave theory for the plane metamaterial lens

Tuesday, June 2, 2009, 15:00 (3:00 p.m.) - Session 4 in 2009
1. On One Generalization of the Method of Extended Boundary Conditions

Author(s): S. P. Skobelev* and Yu. A. Eremin** (*Company "Radiophyzika", Moscow, Russia, **Moscow State University named after M. V. Lomonosov, Russia) (30 min + 15 min for Q&A).

Abstract: A problem of E-polarized plane wave scattering by a perfectly conducting circular cylinder is used for verification of effectiveness of the boundary deformation method proposed recently as a generalization of the method of extended boundary conditions. It is shown that the boundary deformation method can provide high accuracy of satisfaction of the null-field condition on an internal contour chosen according to the indicated method, however the accuracy of satisfaction of that condition corresponding to the determined current for a contour located near the boundary or on the boundary itself turns out to be significantly lower than that achieved when using the ordinary method of extended boundary condition with an internal contour arranged near the boundary. Moreover, it is also shown that enclosing of all the wave field singularities by the contour chosen according to the boundary deformation method does not guarantee correctness of solution of the problem.

2. NONSELF-ADJOINT MODELING STATEMENT AND TOTAL INTERNAL REFLECTION IN THE PEKERIS PROBLEM

Author(s): B. A. Kasatkin and N. V. Zlobina (Institute of marine technology problems FEB RAS, Vladivostok, Russia), (30 min + 15 min for Q&A).

Abstract: Full description of acoustic field in a waveguide in a class of functions satisfying the continuity condition of impedance and continuity condition of pressure and normal component of particle velocity in average on the boundary of the waveguide and half space is constructed in the frame of nonself-adjoint modeling statement of the Pekeris boundary problem. Pairs of normal waves are extracted, where one is a regular wave while another is a generalized wave realizing total internal Newton reflection. Mathematical description of the process of total internal reflection which compensates the effect of soft screen at zero grazing angles and provides the existence of the boundary type on-bottom wave on the impedance interface is constructed.

3. EFFECT OF SUPERFOCUSING OF NONDIRECTIVE DRADIATION IN THE PEKERIS WAVEGUIDE

Author(s): B. A. Kasatkin, N. V. Zlobina and S. B. Kasatkin (Institute of marine technology problems FEB RAS, Vladivostok, Russia), (30 min + 15 min for Q&A).

Abstract: A nonself-adjont modeling statement for boundary problems of reflection of an acoustic or electromagnetic wave in stratified medium is proposed. Using the example of the Pekeris acoustic waveguide, it is shown that a convergent wave of return in case of excitation of spherical components with cylindrical symmetry can arise with an effect of the field superfocusing on the axis of symmetry in the half-space. Analytical description of the superficusing horizons is given, and results of computer modeling of acoustic field in the vicinity of the focal spot are presented. Experimental results on shaping the seabed indirectly confirming the theoretical conclusions are also discussed.

May 05, Tuesday, 15:00 (3:00 p.m.) - Session 3 in 2009
1. Lecture: "MULTIPLY CONNECTED DIELECTRIC WAVEGUIDES FOR APPLICATION IN DIFRACTION DEVICES", (45 min + 15 min for Q&A).
Authors: Dr. V. F. Vziatyshev, S. V. Vladimirov, D. V. Nikolayenko (Moscow Power-Engineering Institute, Russia)

Abstract: Multiply connected dielectric waveguides (MCDW) are a system of longitudinally oriented dielectric elements. The modes of a uniform regular MCDW can be represented as a superposition of the modes of a single element. The influence of element interaction on the propagation constants, critical conditions, and transversal wave numbers can be taken into consideration by means of a linear coupling factor of the adjacent elements. The diffraction phenomena at MCDW rupture as well as at smooth transitions including critical sections are analyzed.
March 03 , 2009, Tuesday, 15:00 (3:00 p.m.) - Session 2 in 2009

1. Lecture: "Wide-angled phased array antenna formed by open-ended waveguides with multi-layered metallodielectric medium in front of the aperture",   (45 min + 15 min for Q&A).
Author(s): Author(s): Dr. Andrey A. Prilutskij (Research Institute of Long-Range Radio Communication, Moscow, Russia)

Abstract: A solution of an electrodynamical problem of radiation from a phased array antenna in the form of an infinite periodic structure of open-ended waveguides is considered. Multi-layered designs consisting of dielectric layers, perforated screens, multi-row grids of strips, cylindrical conductors and dipoles are installed in front of the array aperture. The problem is reduced to a system of integral equations of the 1-st kind, which is solved with respect to the fields in the waveguide and slot apertures or to the currents on the conductors and dipoles. Numerical analysis of influence of the metallo-dielectric medium on the array scanning performance is performed in a wide frequency band. The behavior of the mutual coupling coefficients in various array configurations is studied. The study of edge effects in some finite array fragments is also performed. The computed results are validated both by measurements and by simulations with HFSS. Some results of the indicated simulations are presented and discussed.

2. Lecture: "A New Type of the Quasi-TEM Eigenmodes in a Rectangular Waveguide with One Corrugated Hard Wall",   (45 min + 15 min for Q&A).
Author(s): Author(s): Dr. Sergei P. Skobelev (Company "Radiophyzika", Moscow, Russia)
Abstract: The problem of determining the eigen modes of a rectangular waveguide with one hard wall formed by longitudinal corrugations with grooves filled with dielectric is considered. The characteristic equation is derived by using the asymptotic boundary conditions for corrugated surfaces. It is shown analytically that if the groove depth is equal to the value corresponding to the well-known hard wall condition, the TE eigen mode spectrum of the waveguide contains an infinite set of quasi-TEM modes with different transverse propagation constants and identical longitudinal propagation constants equal to the wave number k. The problem of the waveguide excitation by an elementary dipole is also considered. The results of its solution show good promise for application of the waveguide with oversized dimension along the broad wall as an exciter of a planar array of transverse slots in its upper wall without excitation of the higher-order modes.

February 03 , 2009, Tuesday, 15:00 (3:00 p.m.) - Session 1 in 2009

1. Lecture: "One- and two-dimensional beam forming networks for multibeam antennas on the base of coupled waveguides",   (45 min + 15 min for Q&A).
Author(s):   S. E. Bankov ( Institute of Radio-Electronics, RAS , Moscow, Russia)
Abstract: One- and two-dimensional beam forming networks (BFN) on the basis of arrays of coupled waveguides are considered. The arrays are analyzed with help of coupled waves theory. The BFN with fixed phase shifters and identical waveguides and BFN with different waveguides with orthogonal and hexagonal grids are investigated. It is shown that all the considered BFN form a system of beams with sector type radiation patterns that provides optimal conditions for illumination of multi – beam antenna optical system. It is also shown that multibeam antenna with the proposed BFN forms a system of beams crossed at the level close to –3 dB and the antenna ports are matched and isolated.
2. Lecture: "One dish objective with a cluster feed system",   (45 min + 15 min for Q&A).
Author(s): S. E. Bankov, V. A. Каloshin, E. V. Frolova  ( Institute of Radio-Electronics, RAS , Moscow, Russia)
Abstract: Characteristics of imaging formed by a radio objective with a symmetrical elliptical dish and a linear cluster system are considered. The linear cluster system is exited using a beam forming network (BFN) made as waveguide block with distributed coupling. A BFN with non identical coupled square waveguides made as a PBG structure of metal cylinders is used. It is shown that the one dish objective with the proposed cluster feed system forms a system of beams crossed at the level of –4.7 dB in the focal plane.

December 09, 2008, Tuesday, 15:00 (3:00 p.m.) - Session 8 in 2008

1. Lecture: "Receiving GNSS antennas for high-precision applications", (45 min + 15 min for Q&A).
Author(s): Dmitry V. Tatarnikov (Moscow Aviation Institute/Topcon Corporation, Moscow, Russia)
Abstract: Abstract: Analysis approach and characteristics of experimental and commercial GNSS antennas for high-precision applications have been treated, including low-profile patch antennas with artificial dielectric substrates, multi-patch volumetric designs and flat conductive, impedance and semi-transparent composed media ground planes.

November 11, 2008, Tuesday, 15:00 (3:00 p.m.) - Session 7 in 2008

1. Lecture: "Geometrooptical theory of a flat lens of chiral metamaterial", (45 min + 15 min for Q&A).
Author(s): Victor V. Shevchenko (Institute of Radio Engineering and Electronics named after V. A. Kotelnikov, RAS, Moscow, Russia)
Abstract: Focusing properties of a two-layered flat lens of chiral electromagnetic media with negative permittivity and permeability are considered.

2. Lecture: "Network-oriented modeling of ultra-wideband microwave devices", (45 min + 15 min for Q&A).
Author(s): T. Shevgunov, A. Baev, Y. Kuznetsov (Moscow Aviation Institute, Moscow, Russia)
Abstract: Methods traditionally used in circuit theory can be successfully applied for the synthesis of compact models describing a large class of microwave devices in ultra-wide frequency band. The proposed model consists of dynamic and distributed linear systems providing the macro representation of the main physical processes inside electromagnetic structures. The developed system identification procedure which is based on the stability criterion allows to separate the components of the model and estimate their parameters independently. The realization of the dynamic linear system can be found in the form of the minimal order lumped element circuit. Synthesized network-oriented model can be used in actual problems of applied electrodynamics, e.g., for the reduction of computational efforts in time-domain electromagnetic simulation, as a powerful tool in device optimization loops, etc.

1. Lecture: "Application of WA-systems and R-functions for solving of boundary value problems of electrodynamics",   (45 min + 15 min for Q&A).

Author(s): Victor F. Kravchenko (Institute of Radio Engineering and Electronics of RAS Named After V.A. Kotelnikov, Moscow Russia) and Aleksey V. Yurin (Bauman Moscow State Technical University)

Abstract: A new approach to boundary value problem solving of electrodynamics based on WA-systems and R-functions are considered. The principal advantage is the use of special integral coefficients (the connection coefficients) owing to them it becomes possible to facilitate the computational process greatly. For the concrete physical models of the solving interior boundary value problems of the complex domains the advantages of the new orthogonal wavelets over known are shown. '

2. Lecture: "New Constructions of Orthogonal Wavelets based on Atomic Function ha(x) and their Time-Frequency Distributions in Radio Physical Applications",   (45 min + 15 min for Q&A).

Author(s): Victor F. Kravchenko and Dmitry V. Churikov (Institute of Radio Engineering and Electronics of RAS Named After V.A. Kotelnikov, Moscow Russia)

Abstract: A new construction of new orthogonal Kravchenko wavelets and their time-and-frequency distributions is considered and proved. The report consists of two parts. In the first part the construction of orthogonal Kravchenko wavelets are developed. The second part is devoted to the application of new wavelets in the problems of radar and also digital signal and image processing.

June 03, 2008, Tuesday, 15:00 (3:00 p.m.) - Session 5 in 2008

1. Lecture: "Surface electromagnetic waves: features, formation, transmission", (45 min + 15 min for Q&A).
Author(s): A. A. Kopylov (Moscow, Russia)
Abstract: The problem of surface electromagnetic waves (SEW) is discussed.
It is shown that systems based on SEW such as radiolocation, communication,
control and diagnostics are more effective than based on space waves in some
cases..

May 06, 2008, Tuesday, 15:00 (3:00 p.m.) - Session 4 in 2008

1. Lecture: "Qualitative analysis of fields of electric dipole in non-stationary regime of excitation",   (45 min + 15 min for Q&A).
Author(s): Prof. V. A. Pеrmyakov, and PhD Stud. D. V. Sorokovik (MPEI-TU, Moscow, Russia)
Abstract: Methods of the qualitative theory of ordinary differential equations are applied to studying the evolution of electric and magnetic fields from an electric dipole at harmonic and non-harmonic excitation. The trajectories of the special points (zeros) of the electric and magnetic fields as well as Pointing vector in the spatial and time domains are determined. Conditions of the field special point bifurcation and the local structure of the field strength lines in the special points are found. The field strength line evolution as a whole are studied. Conditions of arising non-trivial structures of the rotational electric field in the vicinity of the dipole at its arbitrary excitation. Forming of such rotational field structures means incorrectness of applying the well known concept of near zone as a spatial region where it is sufficient to describe the electric field in the quasi-static approximation.

2. Lecture: "Qualitative analysis of electromagnetic fields of the Huygens element and elementary turnstile antenna",   (45 min + 15 min for Q&A).
Author(s): Prof. V. A. Pеrmyakov, and PhD Stud. A. N. Koryukin (MPEI-TU, Moscow, Russia)
   Abstract: Methods the qualitative theory of ordinary differential equations are applied to analysis of the electric field structure of two elementary antennas: a Huygens element and an elementary turnstile antenna excited either harmonic or non-harmonic currents. The evolution of zeros of the electric and magnetic fields of the indicated antennas in the spatial and time domains is studied. In case of the Huygens element, conditions of existence of one or two fixed zeros of the electric field at finite distances from the source are determined. In case of the turnstile antenna, conditions are found at which the field special points are located in the plane of the dipoles, while the off-plane electric field polarization can be unambiguously associated with the far field polarization by using the field strength line connecting the corresponding points of the space.

1. Lecture: "Electrodynamics of ultra-wideband electromagnetic pulses in irregular waveguides", (45 min + 15 min for Q&A).

Author(s): V. I. Koroza and M. N. Golikov (Institute of Strategic Stability, Moscow, Russia)

Abstract: A time-domain method of mathematical simulation of the short ultra-wideband electromagnetic pulses (UWB EMP) propagation and transformation in irregular waveguides with ideally conducting walls is presented on the basis of the results published earlier by the authors in the open press. The method based on a system of non-stationary wave equations obtained by using the variational approach allows controlling the accuracy of numerical calculations. Some examples of the study characterizing the process of the UWB EMP propagation and transformation (inter-mode exchange) in transmission lines with distributed and combined (distributed-lumped) discontinuities including topologically broken junctions are presented.

1. Lecture: "Some features of shaping the contour radiation patterns of elements and arrays with dense arrangement of radiators", (45 min + 15 min, Q&A).

Lecturer: Dr. S.P. Skobelev (Joint-Stock Company "Radiophyzika", Moscow, Russia).
Abstract: An infinite planar array of controlled elements in the form of overlapped subarrays excited through a multiport circuit is considered. It is analytically shown that the contour element (subarray) pattern with an ideal contour shape corresponding to the absence of backward mutual coupling and, as a consequence, to the 100% element efficiency can be exactly realized at a definite amplitude distribution over the densely arranged small ideal subarray radiators in spite of the fact that each such a radiator in the array has low radiation efficiency caused by the presence of backward mutual coupling. If the small ideal radiators are controlled directly (without the multiport circuit), then the contour pattern can be formed with 100% array efficiency for any shape of the contour. If the radiators are not ideal, then the efficiency of the array with the contour pattern is determined by averaging the efficiency of the uniformly excited array over the scan region bounded by the contour pattern. The properties of the ideal contour array element pattern and the corresponding aperture distribution are used for development of a simple technique for determining of dimensions and shape of a planar aperture in a multiple beam antenna forming the orthogonal beams arranged in a specified general skew Cartesian lattice.
February 05, 2008, Tuesday, 15:00 (3:00 p.m.) - Session 1 in 2008

1. Lecture: "Resonant behavior and selective switching of stop-bands in multi-component photonic crystals", (45 min + 15 min, Q&A).
Lecturers: M. F. Limonov and M. V. Rybin (Ioffe Physico–Technical Institute, St.-Petersburg, Russia).
Abstract: We demonstrate that in contrast to the well-studied photonic crystals consisting of two homogeneous components, photonic crystals comprised of inhomogeneous or multiple (three or more) components may bring new opportunities to photonics due to the discovered quasi-periodic resonant behavior of their (hkl) stop-bands as a function of the reciprocal lattice vector. A resonant stop-band cannot be switched OFF for any permittivity of structural components. Tuning the permittivity or structural parameters allows the selective ON/OFF switching of non-resonant (hkl) stop-bands. This independent manipulation of light at different Bragg wavelengths provides a new degree of freedom to design selective optical switches and waveguides. Transmission experiments performed on synthetic opals confirmed the theoretical predictions

2. Lecture: "Hybrid Antennas with Large Reflectors and Active Phased Array Feeds", (45 min + 15 min, Q&A).
Author(s): G. V. Savosin, A. V. Seryapin, V. K. Shilo (Research and Production Association of Machine Building, Moscow, Russia), I. L. Vilenko, A. K. Tobolev, A. V. Shishlov ("Radiofizika", Moscow, Russia), M. A. Egorov, A. K. Korolev, L. B. Neronskiy (Corporation "Vega", Moscow, Russia), G. V. Shipilov (Research and Production Association of Applied Mechanics named after Academician M. F. Reshetney, Zheleznogorsk, Russia)
Abstract: Capabilities of hybrid antennas (HA) with large reflectors and active phased array feeds for satellite radar with synthetic aperture are considered. Algorithms of constructive synthesis as well as energetic and radiating performances of HA are described. Peculiarities of active channels of the feed array are described. Simulation performances of HA with reflector of 24 m in diameter are demonstrated.

1. Lecture: "Numerical investigation of stability of super focusing effect of Veselago lens", (45 min + 15 min, Q&A).
Title in Russian: "Chislennoe issledovanie ustojchivosti e'ffekta sverxfokusirovki linzoj Veselago"
Lecturer: Dr. S.E. Bankov (IRE RAS, Moscow, Russia).
Abstract: Electromagnetic wave focusing by Veselago lens with material parameters differing from minus unit was numerically investigated. The following structures were studied: two-dimensional infinite lens, two-dimensional finite length lens in the parallel plate waveguide, three-dimensional finite length lens in the rectangular waveguide.
2. Lecture: "Generalization of a method of the continued boundary conditions", (45 min + 15 min, Q&A).
Title in Russian: "Obobwenie metoda prodolzhennyx granichnyx uslovij"
Lecturer: Dr. A.G. Kyurkchan and N.I. Smirnova (MTUCI, Moscow, Russia).
Abstract: Numerous researches have confirmed, that the method of continued boundary conditions (MCBC) is the most universal, flexible and accessible numerical method for the solution of wave diffraction problems. However in case of the scatterers with analytical boundary it essentially conceded in accuracy, for example, to the modified method of discrete sources. Generalization of MCBC, so that for scatterers with analytical boundary strong deformation of a boundary surface inside of a scatterer down to wave field analytical continuation singularities is supposed, allows to overcome this failing. Thus the boundary condition turns to a null-field condition where the integral equations look like simpler. The new correct formulation of a null-field condition is offered.

November 06, 2007, Tuesday, 15:00 (3:00 p.m.) -Session 7 in 2007

1. Lecture: "To the 70-years anniversary from birthday of Prof. V.V. Shevchenko.
A review of Prof. Shevchenko's publications for the last 10 years", (45 min + 15 min, Q&A).
Title in Russian: "K 70-letiyu so dnya rozhdeniya professora V.V. Shevchenko.
Lecturer: Dr. Byrdin V.M.. (IRE RAS, Moscow, Russia).

2. Lecture: "On integral and spectral representations (decompositions) of wave fields - a review", (45 min + 15 min, Q&A).
Lecturer: Prof. V.V. Sevchenko (IRE RAS, Moscow, Russia).

1. Lecture: "APERTURE ORTOGONAL POLYNOMIALS METHOD IN ANTENNA THEORY (survay)", (45 min + 15 min, Q&A).
Lecturer: Prof. V.I. Gusevsky (SRB MPEI-TU, Moscow, Russia).
Abstract: Aperture orthogonal polynomials' (AOP) method was used in past years for solution of same problems in antenna techniques. It's based on representation of amplitude-phase fields distribution in linear or flat antenna array apertures by a few terms of Fourier series. The orthogonal polynomials sequence is determined by the weight function which corresponds to amplitude distribution. Some antenna problems were solved by means of this method.

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